c0145e5fe1
6659902a73 caused a lot of importing a
lot of things in __init__ which makes loading anything, say session,
really slow. The load time for keystoneclient is really critical since
every client uses it. And having a CLI take several seconds to do
nothing is really bad user experience.
This drops the hot cache import time of keystoneclient.session down to
160ms which is about 60ms faster (down from 220ms without this patch)
for me.
Change-Id: I917503ae54c9abcff417f0a0368abb765a847b6e
Partial-Bug: #1431649
Co-Authored-By: Robert Collins <rbtcollins@hp.com>
79 lines
2.4 KiB
Python
79 lines
2.4 KiB
Python
# Copyright 2012 OpenStack Foundation
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# All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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"""The python bindings for the OpenStack Identity (Keystone) project.
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A Client object will allow you to communicate with the Identity server. The
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recommended way to get a Client object is to use
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:py:func:`keystoneclient.client.Client()`. :py:func:`~.Client()` uses version
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discovery to create a V3 or V2 client depending on what versions the Identity
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server supports and what version is requested.
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Identity V2 and V3 clients can also be created directly. See
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:py:class:`keystoneclient.v3.client.Client` for the V3 client and
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:py:class:`keystoneclient.v2_0.client.Client` for the V2 client.
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"""
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import sys
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import pbr.version
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__version__ = pbr.version.VersionInfo('python-keystoneclient').version_string()
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__all__ = [
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# Modules
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'generic',
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'v2_0',
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'v3',
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# Packages
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'access',
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'client',
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'exceptions',
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'httpclient',
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'service_catalog',
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]
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class _LazyImporter(object):
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def __init__(self, module):
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self._module = module
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def __getattr__(self, name):
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# NB: this is only called until the import has been done.
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# These submodules are part of the API without explicit importing, but
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# expensive to load, so we load them on-demand rather than up-front.
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lazy_submodules = [
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'access',
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'client',
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'exceptions',
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'generic',
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'httpclient',
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'service_catalog',
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'v2_0',
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'v3',
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]
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# __import__ rather than importlib for Python 2.6.
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if name in lazy_submodules:
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__import__('keystoneclient.%s' % name)
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return getattr(self, name)
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# Return module attributes like __all__ etc.
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return getattr(self._module, name)
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sys.modules[__name__] = _LazyImporter(sys.modules[__name__])
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